Post-quantum migration for on-chain identity: an anchored

Sharing an approach we’ve been building and would like scrutiny on. It’s aimed at the narrow but real problem of migrating the signature layer of on-chain / agent identity to post-quantum, and it leans on recomputation rather than trust. The problem. Shor breaks the ECDSA/Schnorr signatures under most of Web3 and most AI-attestation identity. Hashes survive (Grover only halves them). The usual reflex “add a post-quantum signature alongside the classical one” doesn’t actually close it: a forger who derives the classical key just omits the extra signature. A second signature is opt-in from the v